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Section 1: Introduction
1.1
Product Description
1.2
Terminology
The AMETEK Drexelbrook DM330 Series Magnetostrictive
Level System is an integral assembly that measures linear
motion or liquid level using magnetostrictive technology. A
single level output is provided with configurable 4 and 20mA
points in an intrinsically safe, standard two wired loop-powered
configuration.
Unlike conventional level instruments the electronics are
incorporated into the measuring probe and there is no external
electronic housing. This design utilizes sophisticated Surface
Mount Technology (SMT) integrated into a 5/8" diameter tube,
reducing user's cost and offers greater options for insertion
and mounting. The self-contained unit provides IP68 or Nema
4X protection in either rigid 316 stainless steel or flexible
Polyvinylidene Fluoride (PVDF).
There are several reasons for using a flexible PVDF probe
instead of a rigid stainless steel probe:
Limited Headroom: There may be limited space available above
a tank, making it impossible to install a rigid probe without
damaging the probe.
Chemical Compatibility: When an application is not compatible
with 316 SS, then PVDF may be a good alternative.
Large Tanks: Since the 316 SS probe maximum length is 24
feet, PVDF can be substituted for larger tanks. PVDF probes
are available in lengths up to 40 feet. Consult factory for longer
lengths
Other standard options include a quick disconnect mini-
connector or ¾" NPT conduit connection. An optional housing
is available which includes terminal connectors and adjustors
for zero & span.
A variety of floats and mounting accessories are available to
fit nearly all applications. The sanitary stainless steel version
features all welded and polished construction with 180 grit for
food service or 240 grit, ground, and Polished finish for more
stringent sanitary applications.
Magnetostriction: A magnetic field produces small change in
the physical dimension of ferromagnetic materials on the order
of several parts per million in carbon steel and conversely, a
physical deformation or stain (torsion) produces a change of
magnetization in the material.
1
Introduction
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